The coach and president said there is a “50-50” chance the Clippers would either add someone from the buyout market or the Development League, a move that would require waiving someone else. The question came up because of an ESPN report Tuesday that the Clippers could be interested in forward Omri Casspi, waived last month by the Pelicans. While that move doesn’t appear likely, Rivers is keeping open the option of doing something. “We’re always looking at it,” Rivers said, adding, “We’re looking at everything.”